Fat bikers roll with much lower air pressure in their tires than mountain bike or road riders. In loose snow or sand, cyclists typically aim for tire readings of less than 10 pounds per square inch (psi). But many tire gauges fail to accurately measure pressure at such a low range. Instead, you’ll want a specialized instrument, such as the Accu-Gage Low Pressure Bicycle Tire Gauge (ghmeiser.com; $20). Available in two different models, it precisely measures pressure up to 15 or 30 psi.